It was a case of watching your step for the Derry shoppers who braved icy conditions yesterday to take part in the pre Christmas rush.
With no sign of an immediate thaw motorists were also urged to take caution on the roads as rain which fell during Friday night quickly turned to ice.
Some city centre traders complained about footpaths which were left untreated making it unsafe for shoppers and other members of the public.
Meanwhile the PSNI issued a warning to young people throughout the North to air caution around lakes which had frozen over the weekend.
A police spokesman said: "Police cannot warn strongly enough of the danger of these kinds of venturing out onto frozen waterways.
"While ice can appear sturdy and able to support a person's weight, it can become very thin very quickly.
"The surface can easily crack, give way and individuals can fall through. Were this to happen, the chances of rescue or survival would be minimal."
Police also encouraged parents to remind their children about the dangers posed by frozen rivers and lakes.
More snow showers are forecast for the city today.